请教一下如何设置SSH.

我的设置如下:
在结点A和B上:
1./usr/bin/ssh-keygen -t rsa
2./usr/bin/ssh-keygen -t dsa
3.
cat /home/root/.ssh/id_rsa.pub >> /home/root/.ssh/authorized_keys
cat /home/root/.ssh/id_dsa.pub >> /home/root/.ssh/authorized_keys
4.
在结点B上:
ssh root@A cat /home/root/.ssh/id_rsa.pub >> /home/root/.ssh/authorized_keys
ssh root@A cat /home/root/.ssh/id_dsa.pub > /home/root/.ssh/authorized_keys
在结点A上:
ssh root@B cat /home/root/.ssh/id_rsa.pub >> /home/root/.ssh/authorized_keys
ssh root@B cat /home/root/.ssh/id_dsa.pub >> /home/root/.ssh/authorized_keys
5.在结点A和B上:
chmod 644 /home/root/.ssh/authorized_keys

做完以上的操作后,我依然无法可以不用输入密码SSH到其它机器.

请问我以上的设置有哪错漏的吗? 请问要如何才能不用输入密码呢? 谢谢!

chmod 600 /home/root/.ssh/authorized_keys

反正我的方法就是
节点A上：./usr/bin/ssh-keygen -t rsa
cat /root/.ssh/id_dsa.pub >> /root/.ssh/authorized_keys

然后在节点A上，scp -r /root/.ssh hostb:/root/

lz问题解决了吗？

...弄的太复杂了。

简单点儿
在A机器上的操作：
1./usr/bin/ssh-keygen -t rsa(保持默认，一路回车)
2.cat /root/.ssh/id_rsa.pub | ssh 192.168.x.x "cat - >> ~/.ssh/authorized_keys"
注：192.168.x.x是B机器IP，上面这句话实现将A的公钥追加到B机器authorized_keys中。

If you don't understand the messages, paste here. Let us see where the problem occurs.

追加是正解

参照一下我的,希望能对你有用
Server1:10.38.223.234
Server2:10.38.223.195

一、Server1到Server2的SSH创建

1、以root用户在Server1上创建
xuzhou:~ # ssh -l root 10.38.223.195
Password:

xuzhou:~ # ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
2f:15:bd:5a:94:aa:da:0e:4e:c1:5d:d4:be:2f:03:a6 root@xuzhou

注意：输入上面的ssh-keygen命令后，可以不用输入任何信息，直接回车，但也可以根据自己的实际情况来
      设置，其中 -t rsa是指的加密类型，创建后的密钥在root用户主目录的隐藏目录.ssh中

2、进入root用户的.ssh目录查看信息
xuzhou:~ # cd .ssh/
xuzhou:~/.ssh # ls
.  ..  id_rsa  id_rsa.pub  known_hosts
xuzhou:~/.ssh #
注意：其中id_rsa是Server1的私钥，id_rsa.pub是Server1的公钥，known_hosts里面保存着所有已发生连接服务      器的信息。
这里我们需要将公钥里的信息拷贝到登陆服务器Server2的root用户主目录下的.ssh文件authorized_keys中

3、查看生成的公钥信息
xuzhou:~/.ssh # cat id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAuElBG8qyi/jlVRoVU5iDRablt7kmPYTDd38ljBkmVKo9KY9KyYzDRr3mLMwnnEUqPR8F5JLtDwRmH25nVmUElAbchZxgxyqvodpXtVjsvNE8k8iKdM16GavogO09qm8j3YErMY0/+pTK+Ir2ntICnNFpppcVCn1AR6uHOZMxLDE= root@xuzhou

4、将Server1公钥id_rsa.pub传送到Server2的root主目录下.ssh目录间的authorized_keys中（该文件需要手动创   建）
xuzhou:~/.ssh # scp -r id_rsa.pub root@10.38.223.195:/root/.ssh/10.38.223.195
Password:
id_rsa.pub                                                                                        100%  221     0.2KB/s   00:00   
xuzhou:~/.ssh #

5、在Server2上查看拷贝过来的id_rsa.pub内容并将其复制到authorzied_keys
xuzhou:~/.ssh # ssh -l root 10.38.223.195
Password:
Last login: Sun Jul  6 12:20:22 2008 from 10.38.223.239
suining:~ # cd .ssh/
suining:~/.ssh # ls
.  ..  10.38.223.195  known_hosts
suining:~/.ssh # cat 10.38.223.195
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAuElBG8qyi/jlVRoVU5iDRablt7kmPYTDd38ljBkmVKo9KY9KyYzDRr3mLMwnnEUqPR8F5JLtDwRmH25nVmUElAbchZxgxyqvodpXtVjsvNE8k8iKdM16GavogO09qm8j3YErMY0/+pTK+Ir2ntICnNFpppcVCn1AR6uHOZMxLDE= root@xuzhou

6、在Server2创建authorized_keys,并将10.38.223.195这个文件里的内容复制到authorized_keys里面
suining:~/.ssh # touch authorized_keys
suining:~/.ssh # ls
.  ..  10.38.223.195  authorized_keys  known_hosts
suining:~/.ssh # cat 10.38.223.195 >> authorized_keys

7、在Server2上查看复制到authorized_keys的内容
suining:~/.ssh # cat authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAuElBG8qyi/jlVRoVU5iDRablt7kmPYTDd38ljBkmVKo9KY9KyYzDRr3mLMwnnEUqPR8F5JLtDwRmH25nVmUElAbchZxgxyqvodpXtVjsvNE8k8iKdM16GavogO09qm8j3YErMY0/+pTK+Ir2ntICnNFpppcVCn1AR6uHOZMxLDE= root@xuzhou
suining:~/.ssh #

8、退出Server2，再次在Server1上测试SSH到Server2
suining:~/.ssh # exit
logout
Connection to 10.38.223.195 closed.
xuzhou:~/.ssh # ssh -l root 10.38.223.195
Last login: Sun Jul  6 12:49:54 2008 from xuzhou.js
suining:~ #
若发现不需要用户密码就可以登陆成功，说明设置正确

注意：Server2到Server1的SSH创建和上述方法一样，略。

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